FANUC A98L-0031-0028 Battery. The Maxell single cell 3 Volt Battery comes with the 4 pin molded connector fitted inside a cartridge to slide into the back of your Fanuc control. This Battery is fitted on the following series of controls; 30i, 31i, 32i and 35i series controllers and similar generation robots.. The Battery has alternate part numbers of A02B0323K102 for the CNC controls. The Battery back-up memory and storage of the SRAM, PMC, programs and other configuration files necessary for the i controls to run. The Battery cells are genuine Hitachi Maxell 3V series cells fitted in a custom formed cartridge for the FANUC control systems beside the fans, not cheap alternatives in the wrong cartridges.